<template>
  <div class='home-category'  @mouseleave="categoryId = null">
    <!-- 左侧分类 -->
    <ul class="menu">
      <li v-for="item in menulist" :key="item.id" @mousemove="categoryId = item.id" :class="{active:categoryId === item.id}">
        <RouterLink :to="`/category/${item.id}`">{{item.name}}</RouterLink>
        <template v-if="item.children">
            <RouterLink :to="`/category/sub/${sub.id}`" v-for="sub in item.children" :key="sub.id">{{sub.name}}</RouterLink>
        </template>
        <template v-else>
            <XtxSkeleton width="60px" height="18px" bg="rgba(255,255,255,0.2)" style="margin-right:5px"/>
            <XtxSkeleton width="60px" height="18px" bg="rgba(255,255,255,0.2)"/>
        </template>
      </li>
    </ul>
    <!-- 右侧鼠标进入就会显示    也就是弹层-->
    <div class="layer">
      <h4>{{currcategory && currcategory.brands ? '品牌' : '分类'}}推荐 <small>根据您的购买或浏览记录推荐</small></h4>
      <ul v-if="currcategory && currcategory.goods">
        <li v-for="i in currcategory.goods" :key="i.id">
          <RouterLink to="/">
            <img v-lazy="i.picture" alt="">
            <div class="info">
              <p class="name ellipsis-2">{{i.name}}</p>
              <p class="desc ellipsis">{{i.desc}}</p>
              <p class="price"><i>¥</i>{{i.price}}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
      <!-- 品牌分类 -->
      <ul v-if="currcategory && currcategory.brands">
        <li class="brand" v-for="item in  currcategory.brands" :key="item.id">
            <RouterLink to="/">
            <img v-lazy="item.picture" alt="">
            <div class="info">
                <p class="place"><i class="iconfont icon-dingwei"></i>{{item.place}}</p>
                <p class="name ellipsis">{{item.name}}</p>
                <p class="desc ellipsis-2">{{item.desc}}</p>
            </div>
            </RouterLink>
        </li>
    </ul>
    </div>
  </div>
</template>

<script>
import { findAll } from '@/api/home'
import { useStore } from 'vuex'
import { computed, reactive, ref} from 'vue'
export default {
  name: 'HomeCategory',
  setup(){
    // 获取Vuex中的9个分类与新增的一个品牌分类
    const store = useStore()
    // 新增的一个品牌分类
    const brand = reactive({
        id:'brand',
        name:'品牌',
        children:[{id:'brand_children',name:'品牌推荐'}],
        brands:[]
    })
    const menulist = computed(()=>{
        const list = store.state.category.list.map(item=>{
            return {
                id:item.id,
                name:item.name,
                goods:item.goods,
                children:item.children && item.children.slice(0, 2)
            }
            
            
        })
        list.push(brand)
        return list
        
    })

    // 鼠标经过记录的id
    const categoryId = ref(null)
    // 在menulist里面找到鼠标经过时的id，得到分类商品数据 使用计算属性，得到menulist计算属性里面的值list
    // currcategory  当前鼠标经过的每一个左侧分栏，已经找到的值，也就是categoryId重新赋的值，因为本质上判断的是menu里面的数据，即Vuex中的数据
   const currcategory = computed(()=>{
    // 这里表示查找 menulist.value 数组中 id 属性等于 categoryId.value 的对象
     return menulist.value.find(item=>item.id === categoryId.value)
   })
    // 品牌通过接口方法获取数据
    findAll().then(data=>{
        brand.brands = data.result
    })
    
    return {menulist, categoryId, currcategory}
    
  }
}
</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0,0,0,0.8);
  position: relative;
  z-index: 99;
  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;
      &:hover,&.active{
        background: @xtxColor;
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
    }
  }
  // 弹层样式
     &:hover {
    .layer {
      display: block;
    }
  }
}


// 弹层样式
 .layer {
    width: 990px;
    height: 500px;
    background: rgba(255,255,255,0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;
    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;
      small {
        font-size: 16px;
        color: #666;
      }
    }
    ul {
      display: flex;
      flex-wrap: wrap;
      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;
        &:nth-child(3n) {
          margin-right: 0;
        }
        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;
          &:hover {
            background: #e3f9f4;
          }
          img {
              width: 95px;
              height: 95px;
          }
          .info {
            padding-left: 10px;
            line-height: 24px;
		    width: 190px;
            .name {
              font-size: 16px;
              color: #666;
            }
            .desc {
              color: #999;
            }
            .price {
              font-size: 22px;
              color: @priceColor;
              i {
                font-size: 16px;
              }
            }
          }
        }
  
      }
       li.brand {
        height: 180px;
        a {
          align-items: flex-start;
          img {
            width: 120px;
            height: 160px;
          }
          .info {
            p {
              margin-top: 8px;
            }
            .place {
              color: #999;
            }
          }
        }
      }
    }
  
  }
 
//   骨架动画
.xtx-skeleton {
  animation: fade 1s linear infinite alternate;
}
@keyframes fade {
  from {
    opacity: 0.2;
  }
  to {
    opacity: 1;
  }
}

</style>
